METHOD FOR IMPREGNATING UNDER PRESSURE OF TREE AND FORESTRY CONSERVANT CONTAINING VEGETABLE OIL AND WATERPROOFED WOOD

摘要

1. The method of impregnation under pressure of a tree or timber with a preservative containing vegetable oils, in which the tree is impregnated under pressure with a preservative containing vegetable oil, characterized in that before the stage of applying pressure, the tree is heated so that at least part of its internal parts are heated to a temperature of at least 50 ° C, and that after impregnation under pressure in the space surrounding the tree (1), a vacuum is created while heating the surface layers of the tree to temperatures above the boiling point of water, and these conditions are maintained in the space surrounding the tree at least 75 minutes to remove the preservative from the surface layers of wood. ! 2. The method according to claim 1, characterized in that the tree is impregnated with crude tall oil, resin and / or fatty acids isolated from it or a mixture thereof. ! 3. The method according to claim 1, characterized in that the wood is heated with steam during the stage of applying vacuum after impregnation under pressure. ! 4. The method according to claim 1, characterized in that after the step of applying pressure, the preservative content in the surface layer of the tree is adjusted to a level of less than 75%, calculated on the weight of absolutely dry wood. ! 5. The method according to claim 1, characterized in that the tree is impregnated in the impregnation chamber (1), which is heated to a temperature of more than 50 ° C before applying the preservative to the impregnation chamber. ! 6. The method according to claim 5, characterized in that compressed air heated to a temperature of more than 50 ° C is blown into the impregnation chamber (1) before the stage of applying pressure, so that the pressure in the impregnation chamber rises above normal pressure. ! 7.